XIAO NRF52840 Plus

Products & Technology XIAO
11

Hi there,

I could do it for you, but better you find the exact syntax, What you have there will NOT work for a Nordic MCU … (your trying to use SILK_numbers & pin macro’s) you need GPIO numbers :face_with_hand_over_mouth: You want lowest level, you need to use bare metal components. :v:

This Does compile

#include <Arduino.h>
#include <SPI.h>

// Your connector pins
#define SCK_PIN  D11
#define MISO_PIN D12
#define MOSI_PIN D13
#define CS_PIN   D14

void setup() {
  Serial.begin(115200);
  while (!Serial) { /* wait for USB */ }

  // Show the resolved numeric GPIOs (if you’re curious)
  Serial.print("SCK=");  Serial.println(SCK_PIN);
  Serial.print("MISO="); Serial.println(MISO_PIN);
  Serial.print("MOSI="); Serial.println(MOSI_PIN);
  Serial.print("CS=");   Serial.println(CS_PIN);

  // Chip-select is just a normal GPIO. Don’t pass it into SPI begin.
  pinMode(CS_PIN, OUTPUT);
  digitalWrite(CS_PIN, HIGH); // inactive

  // Configure SPI1 to use your pins, then start it
#if defined(SPI1)
  SPI1.setPins(SCK_PIN, MISO_PIN, MOSI_PIN);  // <-- the important bit
  SPI1.begin();
  Serial.println("SPI1 started.");
#else
  Serial.println("ERROR: This board/core doesn't define SPI1.");
#endif
}

void loop() {
#if defined(SPI1)
  // Example transaction @ 8 MHz, mode 0
  SPI1.beginTransaction(SPISettings(8000000, MSBFIRST, SPI_MODE0));
  digitalWrite(CS_PIN, LOW);

  uint8_t whoami = SPI1.transfer(0x9F); // example byte
  // ... more transfers as needed ...

  digitalWrite(CS_PIN, HIGH);
  SPI1.endTransaction();

  Serial.print("Got byte: 0x"); Serial.println(whoami, HEX);
  delay(500);
#endif
}

I have both Scenarios covered, Both MCU’s ESP32 and Nrf52840
Note the Syntax , and for example pin macro’s and Class defines
is most proper.

SPIClass SPI_2(NRF_SPIM2, D9, D8, D10);   // MISO, SCK, MOSI

check here where I use 2 SPI interfaces, you have to explicitly spell it out for the compiler.
and

YES

for like the 3rd time :grin:

Good Stuff , though tricky to track but it’s there.
HTH
GL :slight_smile: Pj :v:

post some code of what it is you want to do.

Notes that save headaches

  • Use setPins(...) + begin(), not SPI1.begin(SCK,MISO,MOSI,CS). Passing pins to begin() only exists on some cores; setPins works on the Adafruit/Seeed nRF52 cores.
  • CS is not part of the SPI peripheral. Always pinMode()/digitalWrite() it yourself.
  • Verifying pin mapping: If you really need raw GPIO numbers, just Serial.println(D11) etc., or open your board’s variants/*/pins_arduino.h to see exactly which nRF port/pin each Dx maps to.
  • Check that SPI1 exists: Some variants only expose SPI (SPIM0). If SPI1 isn’t defined, you’ll need to either use SPI or create another SPIClass bound to NRF_SPIM1 (varies by core; sticking with SPI1 when available is easier).
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